光激发
光催化
等离子体子
表面等离子共振
催化作用
费米能级
材料科学
纳米颗粒
化学物理
电子
共振(粒子物理)
凝聚态物理
化学
纳米技术
光电子学
原子物理学
物理
激发态
生物化学
量子力学
作者
Pin Lyu,Randy Espinoza,Son C. Nguyen
标识
DOI:10.1021/acs.jpcc.3c04436
摘要
Photocatalysis induced by localized surface plasmon resonance of metallic nanoparticles has been studied for more than a decade, but photocatalysis originating from direct interband excitations is still under-explored. The spectral overlap and the coupling of these two optical regimes also complicate the determination of hot carriers' energy states and eventually hinder the accurate assignment of their catalytic role in studied reactions. In this Featured Article, after reviewing previous studies, we suggest classifying the photoexcitation via intra- and interband transitions where the physical states of hot carriers are well-defined. Intraband transitions are featured by creating hot electrons above the Fermi level and suitable for reductive catalytic pathways, whereas interband transitions are featured by generating hot d-band holes below the Fermi level and better for oxidative catalytic pathways. Since the contribution of intra- and interband transitions are different in the spectral regions of localized surface plasmon resonance and direct interband excitations, the wavelength dependence of the photocatalytic activities is very helpful in assigning which transitions and carriers contribute to the observed catalysis.
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